fbdev: Remove deprecated create_singlethread_workqueue

The workqueue "esd_wq" has only a single workitem(&md->esd_work)
and hence doesn't require ordering. Also, it is not being used on a
memory reclaim path. Hence, the singlethreaded workqueue has been
replaced with the use of system_wq.

System workqueues have been able to handle high level of concurrency
for a long time now and hence it's not required to have a singlethreaded
workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue
created with create_singlethread_workqueue(), system_wq allows multiple
work items to overlap executions even on the same CPU; however, a
per-cpu workqueue doesn't have any CPU locality or global ordering
guarantee unless the target CPU is explicitly specified and thus the
increase of local concurrency shouldn't make any difference.

mipid_esd_stop_check () calls cancel_delayed_work() in mipid_cleanup()
to ensure that there are no pending tasks while disconnecting the driver.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/fbdev/omap/lcd_mipid.c b/drivers/video/fbdev/omap/lcd_mipid.c
index 0e4cee9..c81f150 100644 (file)
--- a/drivers/video/fbdev/omap/lcd_mipid.c
+++ b/drivers/video/fbdev/omap/lcd_mipid.c
@@ -60,7 +60,6 @@ struct mipid_device {
        struct mutex            mutex;
        struct lcd_panel        panel;
 
-       struct workqueue_struct *esd_wq;
        struct delayed_work     esd_work;
        void                    (*esd_check)(struct mipid_device *m);
 };
@@ -390,7 +389,7 @@ static void ls041y3_esd_check(struct mipid_device *md)
 static void mipid_esd_start_check(struct mipid_device *md)
 {
        if (md->esd_check != NULL)
-               queue_delayed_work(md->esd_wq, &md->esd_work,
+               schedule_delayed_work(&md->esd_work,
                                   MIPID_ESD_CHECK_PERIOD);
 }
 
@@ -476,11 +475,6 @@ static int mipid_init(struct lcd_panel *panel,
        struct mipid_device *md = to_mipid_device(panel);
 
        md->fbdev = fbdev;
-       md->esd_wq = create_singlethread_workqueue("mipid_esd");
-       if (md->esd_wq == NULL) {
-               dev_err(&md->spi->dev, "can't create ESD workqueue\n");
-               return -ENOMEM;
-       }
        INIT_DELAYED_WORK(&md->esd_work, mipid_esd_work);
        mutex_init(&md->mutex);
 
@@ -500,7 +494,6 @@ static void mipid_cleanup(struct lcd_panel *panel)
 
        if (md->enabled)
                mipid_esd_stop_check(md);
-       destroy_workqueue(md->esd_wq);
 }
 
 static struct lcd_panel mipid_panel = {